linux-kernel - Re: [PATCH 08 of 11] anon-vma-rwsem

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Message-ID: <482C1AA2.20307@qumranet.com>
Date:	Thu, 15 May 2008 14:12:34 +0300
From:	Avi Kivity <avi@...ranet.com>
To:	Robin Holt <holt@....com>
CC:	Nick Piggin <npiggin@...e.de>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrea Arcangeli <andrea@...ranet.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <clameter@....com>,
	Jack Steiner <steiner@....com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	kvm-devel@...ts.sourceforge.net,
	Kanoj Sarcar <kanojsarcar@...oo.com>,
	Roland Dreier <rdreier@...co.com>,
	Steve Wise <swise@...ngridcomputing.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	general@...ts.openfabrics.org, Hugh Dickins <hugh@...itas.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Anthony Liguori <aliguori@...ibm.com>,
	Chris Wright <chrisw@...hat.com>,
	Marcelo Tosatti <marcelo@...ck.org>,
	Eric Dumazet <dada1@...mosbay.com>,
	"Paul E. McKenney" <paulmck@...ibm.com>
Subject: Re: [PATCH 08 of 11] anon-vma-rwsem

Robin Holt wrote:
> Then we need to deposit the information needed to do the invalidate.
>
> Lastly, we would need to interrupt.  Unfortunately, here we have a
> thundering herd.  There could be up to 16256 processors interrupting the
> same processor.  That will be a lot of work.  It will need to look up the
> mm (without grabbing any sleeping locks in either xpmem or the kernel)
> and do the tlb invalidates.
>
>   

You don't need to interrupt every time.  Place your data in a queue (you 
do support rmw operations, right?) and interrupt.  Invalidates from 
other processors will see that the queue hasn't been processed yet and 
skip the interrupt.

-- 
error compiling committee.c: too many arguments to function

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